<template>
  <div>
    <!--顶部滑动条-->
    <div id="slider" class="mui-slider">
      <div id="sliderSegmentedControl"
           class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
        <div class="mui-scroll">
          <a :class="['mui-control-item',item.id===0 ?  'mui-active' : '']"
             v-for="item in cates" :key="item.id"
             @tap="getPhotoListByCateId(item.id)">
            {{item.title}}
          </a>
        </div>
      </div>
    </div>

    <!--图片列表-->
    <ul class="photo-list">
      <router-link tag="li" :to="'/home/photoinfo/'+item.id" v-for="item in list" :key="item.id">
        <img v-lazy="item.img_url">

        <div class="info">
          <h1 class="info-title">{{item.title}}</h1>
          <div class="info-body">{{item.zhaiyao}}</div>
        </div>
      </router-link>
    </ul>
  </div>
</template>

<script>
  import mui from '../../lib/mui/js/mui.min.js';
  import {Toast} from 'mint-ui';

  export default {
    data() {
      return {
        cates: [],//所有分类的数组
        list: []//图片列表的数组
      }
    },
    created() {
      this.getAllCategory();
      this.getPhotoListByCateId(0);//默认进入页面 请求全部图片数据
    },
    mounted() {//当组件中的DOM结构被渲染好并放到页面中后执行
      //初始化滑动控件
      mui('.mui-scroll-wrapper').scroll({
        deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
      });
    },
    methods: {
      getAllCategory() {
        //获取所有的图片分类
        this.$http.get('api/getimgcategory')
          .then(result => {
            if (result.body.status === 0) {
              result.body.message.unshift({
                title: '全部',
                id: 0
              });
              this.cates = result.body.message;
            } else {
              Toast('获取图片失败');
            }
          });
      },
      getPhotoListByCateId(cateId) {
        //根据分类Id获取图片列表
        this.$http.get('api/getimages/' + cateId)
          .then(result => {
            if (result.body.status === 0) {
              this.list = result.body.message;
            } else {
              Toast('获取图片失败');
            }
          });
      }
    }
  }
</script>

<style lang="scss" scoped>
  * {
    touch-action: pan-y;
  }


  .photo-list {
    list-style: none;
    margin: 0;
    padding: 10px 10px 0;

    li {
      background-color: #ccc;
      text-align: center;
      margin-bottom: 10px;
      box-shadow: 0 0 9px #999;
      position: relative;

      img {
        width: 100%;
        vertical-align: middle;
      }

      img[lazy=loading] {
        width: 40px;
        height: 300px;
        margin: auto;
      }

      .info {
        color: #fff;
        text-align: left;
        position: absolute;
        left: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, .4);
        max-height: 85px;

        .info-title {
          font-size: 14px;
        }

        .info-body {
          font-size: 13px;
        }
      }
    }
  }
</style>